# Learn numbers: int and float
# print(2+3)
# print(2-3)
# print(2*3)
# print(2/3)
#

universe_age = 14_000_000000
print(f"universe age is {universe_age}")

x,y,z = 1,5,9.0
print(x+y+z)
CONST = 3.14

# Learn list

# initialize
names = ['TyGuan', 'katherine', 'comrades', 'air', 'void']
print(names[0].title())
print(f"Hi, {names[0].title()}")
print(f"Hi, {names[1].title()}")
print(f"Hi, {names[2].title()}")

# edit elements
names[2] = 'Moyu'
print(names)

# append elements
names.append('ShaoHan')
print(names)

# insert elements
names.insert(2, 'Lizard')
print(names)

# delete elements
# del by number
del names[-2]
print(names)

# pop the last to use
comrade = names.pop()
print(f"{comrade} is a comrade")

# pop by number
# pop(3)

# delete by value
names.remove('air')
print(names)
